JPH08185715A - Electric cable - Google Patents

Abstract

PURPOSE: To integrate a power cable and a signal cable and prevent wire breakage caused by tension to a fine copper wire of the signal cable when the fine copper wire is bent in any direction by connecting a cover of the power cable and a cover of the signal cable with a thin connecting piece. CONSTITUTION: Large copper wires 1b of core wires of a power cable 1 are covered with a cover 1a, fine copper wires 2b of core wires of a signal cable 2 are covered with a cover 2a, and the cover 1a and the cover 2a are connected by a thin connecting piece 3. Two cables 1, 2 are not separated. When the cables 1, 2 are bent in the direction perpendicular to the line connecting the centers of both cables 1, 2, the cables 1, 2 have the same curvature, and the copper wires 2b of the signal cable 2 are prevented from being largely pulled and broken. When the cables 1, 2 are bent in parallel with the line connecting the centers of both cables 1, 2 and to the cable 1 side, the cable 2 is overlapped on the cable 1 side, and the cables 1, 2 have the same curvature, and the copper wires of the cable 2 are prevented from being largely pulled and broken.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an electric cable for connecting a power source and a signal processing circuit to a motor of a machine tool such as a nut runner and a sensor incorporated in the machine tool.

[0002]

2. Description of the Related Art Conventionally, as a general method of using an electric cable of this type, a power cable and a signal cable separated from each other have been connected between a machine tool and a power source and a signal processing circuit. Therefore, there is a problem that the two electric cables are present between the machine tool and the power source and the signal processing circuit, and the two electric cables are entangled during the work, which hinders the work.

Therefore, the two electric cables 1 and 2 are tied with a binding wire 3 such as a wire so as not to be separated from each other, or in the manufacturing process of the electric cables 1 and 2, coatings 1a and 2a of the two electric cables are preliminarily provided. There was one that was integrated.

[0004]

By the way, in the former one, in which the two electric cables 1 and 2 are connected by the binding wire 3, the binding work is troublesome and troublesome, and the binding wire is also troublesome. There was a problem that when 3 was cut, it was separated.

In the latter case, in which the coatings 1a and 2a of the two electric cables 1 and 2 are integrated, the direction (line connecting the centers of the two electric cables is as shown in FIG. When bent in a direction (orthogonal direction to), the signal cable 2 having a thin copper wire 2b and the thick power cable 1 having a copper wire 1b have the same curvature, so that the signal cable 2 is not pulled more than the power cable 1. Signal cable 2
It is unlikely that the copper wire 2b will be disconnected.

However, when the cable is bent in the direction as shown in FIG. 9 (the direction parallel to the line connecting the centers of the two electric cables), the curvature of the signal cable 2 becomes larger than that of the power cable 1. There is a problem that the copper wire 2b of No. 2 is greatly pulled and the possibility of disconnection increases.

The present invention is intended to solve the above-mentioned problems, and an object of the present invention is to integrate a power cable and a signal cable and, even if bent in any direction, a thin copper wire of the signal cable. The purpose is to provide an electric cable that does not break due to the wire being pulled greatly.

[0008]

The electric cable of the present invention is intended to achieve the above-mentioned object, which means: a first cable in which a core wire such as an electric power line covers a thick copper wire;
A second cable in which a core wire of a signal wire or the like covers a thin copper wire, and a jacket of the first cable and a jacket of the second cable are connected by a thin connecting piece, and the connection is also made. It is desirable that the width of the piece be approximately 1/4 of the circumferential length of the first cable.

[0009]

In the electric cable of the present invention configured as described above, since the power cable and the signal cable are connected by the thin connecting piece, the two cables are not separated and the two electric cables are not separated. When the cable is bent in a direction orthogonal to the line connecting the centers of the cables, the power cable and the signal cable have the same curvature, so that the copper wire of the signal cable is not greatly pulled and broken.

When the signal cable is bent in the direction parallel to the line connecting the centers of the two cables and toward the power cable side, the signal cable overlaps with the power cable side and the curvature of the signal cable and the curvature of the power cable. Therefore, the copper wire of the signal cable will not be greatly pulled, and the disconnection can be prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electric cable according to the present invention will be described below with reference to the drawings. The same reference numerals as those in the above-mentioned conventional example indicate the same parts, and the description thereof will be omitted. The first cable (power cable) 1 according to the present invention includes a small number of thick coated copper wires 1b, a large number of threads 1c arranged so as to cover the copper wires 1b, and a magnetic field covering the threads 1c in a bundled state. It is composed of a shielding mesh wire 1d and a coating 1a which covers the mesh wire 1d.

The signal cable (second cable) 2
Represents a large number of thin coated copper wires 2b, a large number of threads 2c arranged so as to cover the copper wires 2b, a magnetic shielding net wire 2d which covers the wires 2c in a bundle, and the net wire 2d. Covering 2
and a.

The coatings 1a and 2a are the same as the coating 1
They are connected by a thin connecting piece 4 which is integrally formed when molding a and 2a. The width of the connecting piece 4 is formed to be approximately 1/4 of the circumferential length of the first cable.

When the electric cable of the present invention thus constructed is bent in a direction perpendicular to the line connecting the centers of the first and second cables 1 and 2 (see FIG. 3), the first and second cables are formed. Since the curvature of 1 and 2 is the same, the copper wire 1 of each cable 1 and 2
b and 2b are not so pulled. Therefore, the copper wire 2b of the thin second cable does not break.

When bent in a direction parallel to the line connecting the centers of the first and second cables 1 and 2 (see FIG. 4), the curvature of the second cable 2 is larger than that of the first cable 1. Since the size of the second cable 2 is increased, a force of displacing the second cable 2 in the direction of decreasing the curvature acts on the connecting piece 4. Therefore, the thin connecting piece 4 is deformed and the second cable 2 overlaps the first cable 1 side (see FIG. 5). Therefore, the curvature of the second cable 2 becomes the same as the curvature of the first cable 1, and the cutting of the copper wire 2b is prevented.

By setting the width of the connecting piece 4 to be approximately 1/4 of the outer circumference of the first cable 1, the second cable 2 easily overlaps with the first cable 1 and the first and second The distance between the cables 1 and 2 is not greatly separated, and it is easy to handle.

[0017]

As described above, according to the present invention, since the first and second cables are connected by the thin connecting piece,
When the two cables are not separated and are bent in the direction parallel to the line connecting the centers of the two cables and when bent to the first cable side, the second cable is The curvatures of the two cables are the same when overlapping on the cable side, so that the copper wire of the second cable having a thin copper wire is not greatly pulled and broken.

Further, by making the width of the connecting piece approximately 1/4 of the outer circumference of the first cable, the second cable easily overlaps the first cable, and the distance between the first and second cables is large. Also has the effect of being easy to handle without being greatly separated.

[Brief description of drawings]

FIG. 1 is a front view of an electric cable according to the present invention.

FIG. 2 is a sectional view taken along line AA of the above.

FIG. 3 is a side view showing a state of being bent in a direction perpendicular to a line connecting the centers of two cables.

FIG. 4 is a plan view showing a state of bending in a direction parallel to a line connecting the centers of two cables.

FIG. 5 is a sectional view of the same as above in a bent state.

FIG. 6 is a perspective view of a conventional electric cable.

FIG. 7 is a perspective view of another conventional electric cable.

FIG. 8 is a perspective view showing a state in which the electric cable is bent in a direction perpendicular to a line connecting the centers of the electric cables.

9 is a perspective view of the electric cable of FIG. 7 bent in a direction parallel to a line connecting the centers thereof.

[Explanation of symbols]

 1 1st cable (power cable) 1a coating 1b copper wire 2 2nd cable (signal cable) 2a coating 2b copper wire 4 connecting piece

Claims (2)

[Claims] 1. A first cable in which a core wire such as a power line covers a thick copper wire, a second cable in which a core wire such as a signal line covers a thin copper wire, a covering of the first cable and the first cable. An electric cable characterized in that the coating of the cable of 2 is connected with a thin connecting piece. 2. The electric cable according to claim 1, wherein the width of the connecting piece is approximately ¼ of the circumferential length of the first cable.